Future astronauts may grow some of their meals inside greenhouses, such as this Martian growth chamber, where fruits and vegetables could be grown hydroponically, without soil.Pat Rawlings/NASA

Food container for use aboard the International Space Station. Food not only provides nutrition for astronauts, but also enhances the psychological well-being of the crew by establishing a familiar element in an unfamiliar and hostile environmeNASA

The first humans to live on Mars might not identify as astronauts, but farmers. To establish a sustainable settlement on Earth's solar system neighbor, space travelers will have to learn how to grow food on Mars a job that could turn out to be one of the most vital, challenging and labor-intensive tasks at hand, experts say.

"One of the things that every gardener on the planet will know is producing food is hard it is a non-trivial thing," Penelope Boston, director of the Cave and Karst Studies program at New Mexico Institute of Mining and Technology, said May 7 at the Humans 2 Mars Summit at George Washington University. "Up until several hundred years ago it occupied most of us for most of the time."

Early Mars colonists may have to revert to this mode of life to ensure their own survival, she suggested. [Cooking Lessons for Mock Mars Mission (Photos)]

Space settlersNASA is actively engaged in researching how to farm on Mars and in space, as the agency is targeting its first manned Mars landing in the mid-2030s. And some NASA officials are wondering if that mission ought to be of long duration, rather than a short visit, given the difficulty of getting there and the possible benefits of an extended stay. "Sustained human presence should that be our goal? I think that's a good discussion," Bill Gerstenmaier, associate administrator of NASA's Human Exploration and Operations Mission Directorate, said May 6.

- Taber MacCallum, Paragon Space Development Corp. CEO

Yet growing food on Mars presents several significant challenges. While research on the International Space Station suggests plants can grow in microgravity, scientists don't know how the reduced gravity on Mars might affect different Earth crops. Mars' surface receives about half the sunlight Earth does, and any pressurized greenhouse enclosure will further block the light reaching plants, so supplemental light will be needed. Supplying that light requires a significant amount of power.

"In terms of the systems engineering required, it's not an insignificant challenge," said D. Marshall Porterfield, Life and Physical Sciences division director at NASA's Human Exploration and Operations Mission Directorate. NASA has been studying using LED lighting to give plants only the wavelengths of light they need to boost efficiency, he said.

Researchers are also studying whether plants can survive under lower pressures than on Earth, because the more pressure inside a greenhouse, the more massive that greenhouse must be to contain it.

Originally posted here:

NASA Wants Farmers on Mars